/Engine/Source/Developer/TraceServices/Public/Common/VariablePagedArray.h
In a page, used items are [ItemOffset .. ItemOffset + ItemCount - 1]. Unused items are [0 .. ItemOffset - 1] and [ItemOffset + ItemCount .. PageSize - 1].
template<typename ItemType> struct TVariablePagedArrayPage
uint64
ItemCount
uint64
ItemOffset
ItemType *
Items